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Hama N, Cheewasedtham W, Rujiralai T. Casein/ferric chloride/polyvinyl alcohol composite for specific in-syringe colorimetric detection of formaldehyde in Hevea brasiliensis latex. Mikrochim Acta 2024; 191:421. [PMID: 38918206 DOI: 10.1007/s00604-024-06491-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Accepted: 06/04/2024] [Indexed: 06/27/2024]
Abstract
A new, simple, and selective colorimetric method of determining formaldehyde in Hevea brasiliensis latex was developed by using a casein/ferric chloride/polyvinyl alcohol hydrogel composite (casein/FeCl3/PVA) in a modified Leach test. Under heating, formaldehyde reacted with 8% casein in the presence of 0.1% FeCl3 and 4.3% HCl (v/v) entrapped in a 30% PVA hydrogel packed in a syringe. A purple-colored product was formed with a maximum absorbance of 525 nm. The color change was evaluated at the color detection zone indicated on the the syringe. The %magenta values were easily evaluated by using a mobile phone application and employed to determine formaldehyde content. The casein/FeCl3/PVA composite gave a readable response in a formaldehyde detection range from 0.04 to 0.80% with a linear response between %magenta and formaldehyde concentration (R2 = 0.9955). The detection limit was 0.032%, and precisions were in the range 0.67-4.94%. The casein/FeCl3/PVA composite was applied to the analysis of ammonia-preserved latex samples, and recoveries of formaldehyde from samples spiked at 0.1, 0.3, and 0.5% ranged from 81.55 to 99.51% (RSDs ≤ 5.41%). The recoveries and precision of the proposed method were comparable with those of high-performance liquid chromatography (HPLC). The developed method was also selective, showing no interference from other latex preservatives, i.e., phenol, ammonia, or tetramethylthiuram disulfide.
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Affiliation(s)
- Nuryanee Hama
- Center of Excellence for Innovation in Chemistry, Division of Physical Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand
- Analytical Chemistry and Environment Research Unit, Division of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand
| | - Wilairat Cheewasedtham
- Analytical Chemistry and Environment Research Unit, Division of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand
| | - Thitima Rujiralai
- Center of Excellence for Innovation in Chemistry, Division of Physical Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand.
- Analytical Chemistry and Environment Research Unit, Division of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand.
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Li JX, Zhang YQ. Mechanically Robust Poly(vinyl alcohol)-Egg White Composite Hydrogel with Enhancing Biocompatibility by Unidirectional Nanopore Dehydration. ACS OMEGA 2023; 8:33763-33773. [PMID: 37744826 PMCID: PMC10515601 DOI: 10.1021/acsomega.3c04171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 08/30/2023] [Indexed: 09/26/2023]
Abstract
A simple and green method, unidirectional nanopore dehydration (UND), directly processes 10% poly(vinyl alcohol) (PVA) aqueous solution containing 20% egg white (EW) into a composite hydrogel membrane (PVA-EW). The tensile strength and elongation of the UND-based PVA-EW at 25 °C were 0.91 MPa and 534.17%, respectively, while the two values at 70 °C were increased by 700 and 38%, respectively. The PVA-EW (70 °C) was still dominated by random coils and α-helical structures. The hydroxyl groups of intramolecules and intermolecules of both PVA and EW could be able to combine and form either more hydrogen bonds or stronger hydrogen bonds. PVA-EW is soft and translucent, has good mechanical properties, and has a porous networked structure with pores that have a diameter of 1-10 μm. L-929 mouse fibroblasts were found to be able to adhere, grow, and proliferate well on the hydrogel composite membrane. This novel PVA-EW biomaterial has potential applications in biomaterials especially medical tissue engineering.
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Affiliation(s)
- Ji-Xin Li
- School of Biology and Basic
Medical Sciences, Medical College, Soochow
University, RM702-2303, No. 199, Renai Road, Industrial Park, Suzhou 215123, P. R. China
| | - Yu-Qing Zhang
- School of Biology and Basic
Medical Sciences, Medical College, Soochow
University, RM702-2303, No. 199, Renai Road, Industrial Park, Suzhou 215123, P. R. China
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Bhat VG, Narasagoudr SS, Masti SP, Chougale RB, Vantamuri AB, Kasai D. Development and evaluation of Moringa extract incorporated Chitosan/Guar gum/Poly (vinyl alcohol) active films for food packaging applications. Int J Biol Macromol 2022; 200:50-60. [PMID: 34973266 DOI: 10.1016/j.ijbiomac.2021.12.116] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 12/11/2021] [Accepted: 12/18/2021] [Indexed: 11/05/2022]
Abstract
The present study contributes the synthesis of active films with the incorporation of moringa extract (ME) into chitosan (CS)/guar gum (GG)/poly(vinyl alcohol) (PVA) matrix (CGPM) by simple solvent casting technique. The effect of ME on the mechanical, thermal, structural and morphological properties of CGPM active films were investigated. ME has shown a marked influence on the optical, thermal properties and swelling behaviour of CGPM active films. The improvement in the tensile strength of CGPM-1 active film (53.7 MPa) was observed compared to control CS/GG/PVA (CGP) film. DSC study revealed that glass transition temperature (Tg) and melting temperature (Tm) decreased with the addition of ME in the CGP matrix, which confirmed the miscibility among the components of active films. There was an improvement in the thermal stability of the CGPM active films. The FTIR study confirmed the molecular interaction between ME and CS/GG/PVA matrix. The XRD analysis showed a decrease in crystallinity with an increase in the ratio of CS for CGPM active films. The CGPM active films were an excellent barrier to UV- light and have exhibited a decrease in moisture adsorption and water solubility compared to CGP control film. The inclusion of ME in the CGP matrix leads to the formation of a dense compact surface, which in turn enhanced hydrophobicity of active films. The CGPM active films showed minimum WVP, OP values and overall migration values were within the limits of 10 mg/dm2. It was also observed that CGPM active films effectively inhibited the growth of E. coli and S. aureus bacteria. These findings suggest CGPM active films are biodegradable, biocompatible, non-toxic and hence can find application as food packaging materials.
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Affiliation(s)
- Veena G Bhat
- Department of Chemistry, Karnatak Science College, Dharwad 580 001, Karnataka, India
| | | | - Saraswati P Masti
- Department of Chemistry, Karnatak Science College, Dharwad 580 001, Karnataka, India.
| | - Ravindra B Chougale
- Post-Graduate Department of Chemistry, Karnatak University, Dharwad 580 003, Karnataka, India
| | - Adiveppa B Vantamuri
- Department of Biotechnology, Karnatak Science College, Dharwad 580 001, Karnataka, India
| | - Deepak Kasai
- Department of Chemistry, Faculty of Engineering and Technology, Jain (Deemed-to-be University), Bangalore, India
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Morinval A, Averous L. Systems Based on Biobased Thermoplastics: From Bioresources to Biodegradable Packaging Applications. POLYM REV 2021. [DOI: 10.1080/15583724.2021.2012802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Alexis Morinval
- BioTeam/ICPEES-ECPM, UMR CNRS 7515, Université de Strasbourg, Strasbourg, Cedex 2, France
| | - Luc Averous
- BioTeam/ICPEES-ECPM, UMR CNRS 7515, Université de Strasbourg, Strasbourg, Cedex 2, France
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Sohini Chakraborty, Mathew MM, Simon R, George N, Vadakkekara A, Mary NL. Antibacterial Activity of Polymer Blend Nanocomposites with the Incorporation of Bentonite and Gold Nanorods. POLYMER SCIENCE SERIES B 2021. [DOI: 10.1134/s1560090421050031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ucpinar Durmaz B, Aytac A. Preparation and properties of poly (vinyl alcohol)/sodium caseinate blend films crosslinked with glutaraldehyde and glyoxal. JOURNAL OF POLYMER ENGINEERING 2021. [DOI: 10.1515/polyeng-2021-0131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Bio-based films containing poly (vinyl alcohol)/casein have poor mechanical and water vapor barrier properties that limit their use in packaging application. Some properties such as water resistance and tensile strength can be increased by the cross-linking process. For this reason, poly(vinyl alcohol)/sodium caseinate (PVA/SC) blends were crosslinked by adding glutaraldehyde (GLA) and glyoxal (GL) at different ratios in this work. The films were prepared by solution casting technique. Fourier transform infrared analysis (FTIR) confirmed the crosslinking reaction between the components. As a result of the crosslinking, the thicknesses, water vapor barrier properties and water contact angle values of the films have increased. The total soluble matters (TSM) of PVA/SC film decreased with increasing amounts of crosslinkers and GLA crosslinked films exhibited lower TSM. The addition of GLA and GL resulted in more strengthened films as verified by the tensile test. On the other hand, GLA crosslinked films were more flexible than un-crosslinked and GL crosslinked PVA/SC films. The hydrophilic PVA/SC film became more hydrophobic with the increasing amounts of crosslinkers. With the crosslinking, the PVA/SC film became more thermally stable. In conclusion, the crosslinked PVA/SC films were obtained with suitable properties for packaging applications.
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Affiliation(s)
- Bedriye Ucpinar Durmaz
- Department of Chemical Engineering , Engineering Faculty, Kocaeli University , 41380 Kocaeli , Turkey
| | - Ayse Aytac
- Department of Chemical Engineering , Engineering Faculty, Kocaeli University , 41380 Kocaeli , Turkey
- Polymer Science and Technology Programme, Kocaeli University , 41380 Kocaeli , Turkey
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Bhat VG, Narasagoudr SS, Masti SP, Chougale RB, Shanbhag Y. Hydroxy citric acid cross-linked chitosan/guar gum/poly(vinyl alcohol) active films for food packaging applications. Int J Biol Macromol 2021; 177:166-175. [PMID: 33607136 DOI: 10.1016/j.ijbiomac.2021.02.109] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 02/11/2021] [Accepted: 02/14/2021] [Indexed: 02/06/2023]
Abstract
The present work aims to prepare Chitosan (CS)/Guar gum (GG)/Poly(vinyl alcohol) (PVA) cross-linked with Hydroxy citric acid (HCA) (CGPH active film) by solvent casting technique. The influence of HCA on different CS/PVA ratio (1:3, 1:1, 3:1) in presence of the fixed amount of GG (0.2%) was investigated. The analysis of the results showed that the addition of HCA to the different ratio of CS/PVA increased the degradation temperature and improved the mechanical properties of CGPH active films. FTIR spectra and XRD analysis revealed strong interactions among the components of CGPH active films. The analysis of SEM images and water contact angle suggested a compact, dense film surface with hydrophobic nature. Further, all the active films have shown a decrease in water vapour permeability (WVP) and acted as a barrier to UV-light. CGPH active films effectively inhibited the growth of S. aureus and E. coli bacteria. With all these features the CGPH active films can find application in food packaging.
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Affiliation(s)
- Veena G Bhat
- Department of Chemistry, Karnatak Science College, Dharwad 580 001, Karnataka, India
| | | | - Saraswati P Masti
- Department of Chemistry, Karnatak Science College, Dharwad 580 001, Karnataka, India.
| | - Ravindra B Chougale
- Post-Graduate Department of Chemistry, Karnatak University, Dharwad 580 003, Karnataka, India
| | - Yogesh Shanbhag
- Department of Chemistry, KLE Technological University, Hubli 580031, Karnataka, India
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Poly(Vinyl Alcohol) Recent Contributions to Engineering and Medicine. JOURNAL OF COMPOSITES SCIENCE 2020. [DOI: 10.3390/jcs4040175] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Poly(vinyl alcohol) (PVA) is a thermoplastic synthetic polymer, which, unlike many synthetic polymers, is not obtained by polymerization, but by hydrolysis of poly(vinyl acetate) (PVAc). Due to the presence of hydroxylic groups, hydrophilic polymers such as PVA and its composites made mainly with biopolymers are used for producing hydrogels that possess interesting morphological and physico-mechanical features. PVA hydrogels and other PVA composites are studied in light of their numerous application for electrical film membranes for chemical separation, element and dye removal, adsorption of metal ions, fuel cells, and packaging. Aside from applications in the engineering field, PVA, like other synthetic polymers, has applications in medicine and biological areas and has become one of the principal objectives of the researchers in the polymer domain. The review presents a few recent applications of PVA composites and contributions related to tissue engineering (repair and regeneration), drug carriers, and wound healing.
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